X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
X-Recipient: djgpp AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=message-id:date:from:user-agent:mime-version:to:subject:references
         :in-reply-to:content-type:content-transfer-encoding;
        bh=KRUsOHIQ3Bef5/iLniGLb+8zJb0IiCzTkvDJLN5Qbuw=;
        b=xsGBnoHep0aDX+ajAHkMw4r+wmMOwfEEwQ+2yJrDjN9EuBJTJK9tY7gyUdLV+DK0B3
         4pj8ScCLw50hmDi8exJFZ7lrkbzoDCV1oGOEZuHmkaAHKf9NCVjtXpdscfWAXO3fsNSM
         +xQgldz+ONXdokY74c2cxBXvP/9Iwcq88GwbGUDBO7k6eIg3Tj4Kzsh2p1k6VChTENpU
         DLkyzjEbJagZyeUpg9Cgxv/DNn178ObE0pYEkJyHKhevwibeIaXxPyOKGrNKCfztcq2z
         gFTLXoHQWg91V06FIlJn9t/aILAaPrVLjqoT6UK+R+OJVLV9av8YRNeJPoh5vL+D6Aio
         rFjA==
X-Received: by 10.50.147.10 with SMTP id tg10mr19767142igb.36.1434960493336;
        Mon, 22 Jun 2015 01:08:13 -0700 (PDT)
Message-ID: <5587C26B.6010800@gmail.com>
Date: Mon, 22 Jun 2015 04:08:11 -0400
From: "Frank Sapone (emoaddict15 AT gmail DOT com)" <djgpp AT delorie DOT com>
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.7.0
MIME-Version: 1.0
To: djgpp AT delorie DOT com
Subject: Re: Detecting Windows NT in DJGPP
References: <201506091712 DOT t59HCPci004068 AT delorie DOT com>	<55775E64 DOT 2090901 AT gmail DOT com>	<CAB9Rao-Njdr-CB=vqHnb+TVDmXu3eXqsB5CHB7V0kDwBEsM-WQ AT mail DOT gmail DOT com>	<5579ED42 DOT 6070309 AT gmail DOT com>	<CAB9Rao8cvu3hLEf=KsRWn7woXka0F9Aax7uM9Jj5QqCO=1bL8w AT mail DOT gmail DOT com>	<5579FE8D DOT 3080501 AT gmail DOT com>	<557B436F DOT 1050101 AT gmx DOT de>	<fe60143b-fe03-451f-84d4-a7d59a67cefc AT googlegroups DOT com>	<d1f33445-bef3-42d5-a343-55fed9868908 AT googlegroups DOT com>	<779efaf6-8ebf-4f2a-a526-a2773e3909b4 AT googlegroups DOT com>	<4131b54f-b34d-4a84-ada6-3443ed9efce9 AT googlegroups DOT com>	<20150618-004800 DOT 313 DOT 0 AT Your-Name-Here DOT News>	<fda73a64-d86c-400d-a78d-4d11b067d138 AT googlegroups DOT com>	<CAA2C=vCYCjih4r38XZ45TURJPxpKAF40kakFM8iRizDH08QbVQ AT mail DOT gmail DOT com>	<65ad24c7-0888-4526-9395-e262f348a021 AT googlegroups DOT com>	<5584B697 DOT 60303 AT gmail DOT com>	<CAA2C=vDpU5XoXZ=3MNiaE1zY8FEwGm_Cki4bd8mQpBFJ9DZ2Vw AT mail DOT gmail DOT com>	<5587B696 DOT 10304 AT gmail DOT com> <CAA2C=vCOrPG=5cSvFn89aqy-1BDu=3TGbVbxXovhrMrTH29RiQ AT mail DOT gmail DOT com>
In-Reply-To: <CAA2C=vCOrPG=5cSvFn89aqy-1BDu=3TGbVbxXovhrMrTH29RiQ@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Reply-To: djgpp AT delorie DOT com

> The allegro library (allegro-4.2.3.1, http://alleg.sourceforge.net/)
> has a detect_os() procedure in its src/dos/dsystem.c. Its NT detection
> is based on environment variable check, though, along with a call to
> _get_dos_version().
>
> --
> O.S.
I was hoping maybe somebody knew of a quirk of using regs to check a 
value that NTVDM would only give back.

Frank